Name: Rakhi R
Affiliation: NSS College, Pandalam, Pathanamthitta, Kerala 689501
Conference ID : ASI2022_237
Title : Ultraviolet view of star formation in young tidal dwarf galaxies around NGC 5291
Authors : Rakhi R, Geethika Santhosh, Prajwel Joseph, Koshy George, Smitha Subramanian, Indulekha K
Abstract Type: Poster
Abstract Category : Extragalactic Astronomy
Abstract : The Ultraviolet continuum is a direct tracer of recent star formation activity in galaxies. The UVIT on-board AstroSat with its superior angular resolution permits a detailed study of recent star formation in the tidal tails of nearby interacting galaxies. NGC 5291 is an interacting galaxy system, around 62 Mpc away. It lies in the western outskirts of the cluster Abell 3574 in the constellation Centaurus. The NGC 5291 system has drawn special attention because of the unusually high amount of atomic gas (roughly around 5×10^10M⊙) distributed as a huge and fragmented ring around it. The ring possibly formed after tidal interaction with a companion galaxy. Numerous UV bright knots are seen against the HI emission, over a region extending roughly 4 arcmin to the north and 4 arcmin to the south of the galaxy. Previous studies in the optical and radio have shown these knots to be vigorous star-forming regions. It has been suggested that some of them may be young tidal dwarf galaxies (TDGs). Results of a study, using NUV and FUV data (exposure time greater than 8 ks) from UVIT, on the star forming knots is presented. Extinction corrected star formation rate (SFR) of knots associated with regions having HI column density greater than 5.0 × 10^20 cm^−2 is determined. The total SFR obtained is 1.69 ± 0.02 M⊙ yr^−1 , which is more than 25% of the extinction-uncorrected SFR value determined using GALEX data. A few other measures, associated with star formation in these knots, are also presented